Diaphragm for sound-reproducing machines



s- 5, 1930. A. E. sQukARs 1,772,163

DIAPHRAGM FOR SOUND REPRODUCING MACHINES Filed May 22, 1925 attorney:

15 of the character specific Patented Aug. 5, 1930 UNITED .STATES PATENTOFFICE matron SQUYABB, OI VALDOSTL GEORGIA, ASSIGII'OB OI orm-ms TOTHOMAS 0, ICLENDON, OI VALDOSTA, GEORGIA! Application 'fled Kay 22,

This invention relates to diaphragms for sound reproducing machines, andhas forone of its principal objects the provision of a diaphragm whichmay be em loyed inconnection with standard makeso machines, and

which will aid substantially in the clear reproduction of sound.-

Another and equally important object of the invention is to provide adiaphragm which will re reduce the recorded sounds without artificial,metallic, rasping, or other objectionable noises usually present insound reproducing machines.

A further object is to rovide a diaphragm (Y which is durable, of highlysimplified construction, and cheap to manufacture.

Other objects and advantages will be apparent during the course of thefollowing description;

In the accompanying drawings forming a part of this application, and inwhich like numerals are employed to designate like parts throughout thesame Fig. 1 is a perspective view of the improved dia hragm.

ig. 2 is'a sectional r spec tive of the same.

In the drawings w erein for the purpose of illustration is shown apreferred embod1- ment of the invention, the numeral 5 designatestheimproved diaphragm, which as illustrated in Fig. 1 is in the nature of adiscshaped body having a marginal rim 6. The

will not set up objectionable foreign noises.

Particular attention is directed to the fact that the web or centralportion of the body of the diaphragm is of approximately the samethickness as the marginal rim 6, and that the edge portion of the web,or that portion of the web whichfjoins the marginal rim is aproximatelyonehalf as thick as the rim.

is. provides an attaching -portion of the stre h without making the webint where the nry I unneoessarilyt ick at the necessary'movement takestp ace. In the-manufactured ennproved diabody of the diaphragm isgradually and u'ni- 1925. Serial m. 82,181.

phragin, I employ a composition of hard fiber and chamois skin, andgrind the same together into a sin le mixture. This hard fiber may be inthe orm of wood pulp. The mixed fiberand chamois skin are now compressedinto the form of a hard sheet in a heavy dut press, and are then cutinto the form of 'scs. The discs are treated with benzol .and anilinedyes, and arethen put in another press and pressed into the shape il-00. lustr'afed in the drawing. 1

Finally, the diaphragm is coated wtih shellac and polished. It isbelieved to be well known that the shellac coating preserves andprolongs the life of the diaphragm.

It is believed to be obvious that the improved diaphragm may be easilymounted in the usual manner, and'in use will reproduce the recordedsounds without setting up objectionable sympathetic noises.

The discs are first treated with benzol so that they will be renderedmore flexible and are subsequently treated with aniline dye which givethe disc a color and fill up any pores that may be present therein. 7

Having thus described the invention, what is claimed is: g i

1. A diaphragm consisting of a compli'ie'ssed mixture of hard fiber andchamois 2. A diaphragm consistin of a compressed mixture of hard fiberand c amois skin, and said diaphragm being coated with shellac.

In testimony whereof I aflix my signature.

, ALEXANDER E. 'SQUYABS.

